In this article is to describe the steps in the implementation of an energy management system and its application to a case study, this case was a hospital for cardiovascular diseases. The implementation of the energy management system in this center has been validated previously by the authors in many companies with different missions whether the productive sector and services. This method is result of several approach complementations from other existing methods, adding thermodynamics and

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... ematical-statistical tools. The aims of the method is to provide a tool that allows diagnose the energy management stage in enterprise or services center and at the same time address the enterprise energy management to achieving an efficient use of the energy carriers. The most important result of the implementation of the method in a hospital were the followings: Areas and equipment Higher Energy consumers, percentage of electricity not associated with patients serving directly, the ratio between the number of assist patients per month and the energy efficiency. These results allow know the potential savings in the hospital and establish an action plan.